US11208304B2 - Limited rotation slewing ring crane - Google Patents

Limited rotation slewing ring crane Download PDF

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Publication number
US11208304B2
US11208304B2 US16/985,300 US202016985300A US11208304B2 US 11208304 B2 US11208304 B2 US 11208304B2 US 202016985300 A US202016985300 A US 202016985300A US 11208304 B2 US11208304 B2 US 11208304B2
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respect
pedestal
wheel
rotation
slewing ring
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US16/985,300
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US20210061625A1 (en
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Rossano CERESOLI
Piantoni Giorgio
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FASSI GRU SpA
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FASSI GRU SpA
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Assigned to FASSI GRU S.P.A. reassignment FASSI GRU S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CERESOLI, ROSSANO, GIORGIO, PIANTONI
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/46—Position indicators for suspended loads or for crane elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/88—Safety gear
    • B66C23/94—Safety gear for limiting slewing movements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/16—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs supported by columns, e.g. towers having their lower end mounted for slewing movements
    • B66C23/163—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs supported by columns, e.g. towers having their lower end mounted for slewing movements where only part of the column rotates, i.e. at least the bottom part is fixed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B66C23/42—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes with jibs of adjustable configuration, e.g. foldable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/84—Slewing gear

Definitions

  • the present invention refers to a limited rotation slewing ring crane, particularly a limited rotation slewing ring crane provided with a sensor of the rotation of the column with respect to the pedestal.
  • Slewing ring cranes are a particular type of loading cranes, which differ from the rack cranes by the way the column and pedestal are rotatively coupled to each other.
  • the slewing ring cranes comprise a bearing coupling (the slewing ring) for providing such relative rotation.
  • the slewing ring cranes in comparison with the rack cranes, although are structurally complex, provide more power to the rotation.
  • the slewing ring cranes are divided in unlimited rotation slewing ring cranes and limited rotation slewing ring cranes.
  • the first ones are characterized by the fact that the column rotation with respect to the pedestal is unlimited, while the second ones are provided with stop elements limiting the rotation arc of the column with respect to the pedestal.
  • the unlimited slewing ring cranes are structurally more complex than the limited rotation slewing ring cranes because the former require the presence of electric and hydraulic joints at the rotative coupling between the column and pedestal which are arranged in order to prevent the hydraulic pipes and electric cables from twisting due to the potentially unlimited rotations of the column with respect to the pedestal.
  • the limited rotation slewing ring cranes do not have this problem, consequently they do not require hydraulic and electric joints.
  • Loading cranes are provided with multiple sensors, which are required for supplying a measurement of magnitudes representative of the state of the crane, and consequently, ultimately, for enabling an effective operation.
  • One of the required sensors is the rotation sensor apt to measure the rotations of the column with respect to the pedestal.
  • an object of the present invention is to provide a limited rotation slewing ring crane equipped with a sensor of the rotation of the column with respect to the pedestal which is a structurally simplified and less expensive alternative to the solution provided in the unlimited slewing ring cranes.
  • a limited slewing ring crane comprising a pedestal, a column rotatively coupled, about a first rotation axis, to the pedestal by a slewing ring rotative coupling, and means for limiting the relative rotation of the column with respect to the pedestal, further comprising a rotative sensor adapted to measure a rotation angle of the column with respect to the pedestal, wherein said rotation sensor comprises:
  • FIG. 1 is a side view of a limited rotation slewing ring crane according to an embodiment
  • FIG. 2 is a perspective view of a detail of crane in FIG. 1 ;
  • FIG. 3 is a perspective view of the lower side of the detail of crane in FIG. 2 ;
  • FIG. 4 is a perspective view of a detail of a crane sensor according to an embodiment
  • FIG. 5 is a partially phantom perspective view of the detail of sensor in FIG. 3 ;
  • FIG. 6 is an exploded perspective view of the detail of sensor in FIG. 3 .
  • reference 1 generally indicates a limited rotation slewing ring crane.
  • the crane 1 comprises a column 2 rotating about a rotation axis with respect to a pedestal 3 , and one or more arms 4 ′, 4 ′′, eventually of the extendable type.
  • the extendibility of the arms is obtained by a plurality of extensions 5 translatingly movable from each other, operated by hydraulic actuators, in order to vary the axial extension of a corresponding arm.
  • only the second arm 4 ′′ is extendable by moving the extensions 5 .
  • the base of the column 2 is rotatively coupled to the pedestal 3 by a rotative coupling 6 comprising a slewing ring 7 .
  • the term “slewing ring” means an axial bearing particularly adapted to operate at low rotation speeds and with high axial loads, comprising an inner crown and outer crown coupled by one or more crowns of balls or rolls such to enable the relative rotations.
  • the term “base” of the column indicates the portion of the column 2 proximate to the pedestal 3 , in other words the lower portion of the column 2 , with reference to the normal conditions of use of crane 1 .
  • the crane 1 comprises means for limiting the relative rotation of the column 2 with respect to the pedestal 3 .
  • the rotative coupling 6 can comprise one or more mechanical stop elements capable of limiting the relative rotation of the column 2 with respect to the pedestal 3 .
  • such mechanical stop elements comprise a crescent-shaped slot 8 , preferably made in the pedestal 3 , and at least one pin 9 , preferably associated to the column 2 , parallel to and radially distanced from the rotation axis of this latter, sliding inside said slot 8 . Constraining the pin 9 to slide inside the slot 8 limits the angular amplitude of the column 2 rotation with respect to the pedestal 3 .
  • the column 2 rotation with respect to the pedestal 3 can be electronically limited, for example by shutting off the supply to the crane 2 if the column relative rotation preset limits 2 with respect to the pedestal 3 are exceeded.
  • the crane 1 comprises a rotative sensor 10 adapted to measure a rotation angle of the column 2 with respect to the pedestal 3 , of which a description according to some possible embodiments of the invention will be provided. It is observed that such rotative sensor 10 can also be used for monitoring if the position of the column 2 falls inside preset rotation limits with respect to the pedestal if the mechanical stop elements are not provided.
  • such rotative sensor 10 comprises a tubular body 11 placed at the base of the column 2 and axially protruding from the same preferably towards the inside of the pedestal 3 (in other words towards the ground, with reference to the normal conditions of use of the crane 1 ).
  • the tubular body 11 is rotatively integral with the column 2 .
  • the tubular body 11 is made by a piece distinct from the column 2 and is fixedly connected to the latter. It is observed that the electric cables and hydraulic pipes (not shown in the figures) extend through the tubular shape of the tubular body 11 towards the crane arms.
  • the tubular body 11 comprises an auxiliary crown 12 , concentric with it and rotatable about the same rotation axis integrally with the tubular body 11 .
  • auxiliary crown 12 is made of a deformable material, wherein the term “deformable” does not mean a deformation of a limited amount, such as the one affecting a rigid material for example (such as a metal) subjected to a pressure, but a macroscopic deformation obtained by using a naturally deformable and yielding material.
  • auxiliary crown 12 can be made of an elastomeric material, such as rubber.
  • the auxiliary crown 12 of wheel 14 of sensor 10 is removable from the wheel itself.
  • the auxiliary crown 12 can comprise a removable O-ring. Consequently, the deformable crown 12 can be simply substituted when the same is worn.
  • the rotative sensor 10 comprises a stationary body 13 connected, by ways explained in the following, to the pedestal 3 , and a wheel 14 rotatable with respect to the stationary body 13 , which is meshed by the tubular body 11 , particularly by the auxiliary crown 12 of the tubular body 11 , so that a rotation of the column 2 matches a rotation of the wheel 14 of the sensor 10 .
  • the stationary body 13 and wheel 14 are positioned with respect to the pedestal 2 so that the wheel 14 rotation axis with respect to the stationary body 13 is offset, in other words does not overlap, with respect to the column 2 rotation axis with respect to the pedestal 3 .
  • the wheel 14 rotation axis with respect to the stationary body 13 is parallel to the column 2 rotation axis with respect to the pedestal 3 .
  • the wheel 14 comprises circumferentially placed raised elements 15 , shaped as teeth developing along the axial direction of wheel 14 , apt to deform the auxiliary crown 12 of tubular body 11 and therefore in order to ensure a high friction between this latter and wheel 14 .
  • wheel 14 can comprise a deformable circumferential crown (not shown in the figures), made of a deformable material having characteristics analogous to the ones described with reference to the possible deformable material by which the auxiliary crown 12 of tubular body 11 can be made, according to what was previously described.
  • the deformable crown is removable from the wheel 14 , so that can be substituted in case of wear and/or failure.
  • the deformable crown can be positioned above the raised elements 15 in order to generally take a toothed shape.
  • wheel 14 and tubular body 11 can have different diameters from each other so that between them there is a transmission ratio different from 1, given by the ratio of the corresponding diameters.
  • wheel 14 In order to enable the rotations of wheel 14 with respect to the stationary body 13 , wheel 14 preferably comprises a shaft 17 connected to the stationary body 13 by one or more bearings 30 .
  • the sensor 10 comprises means 31 for sensing the angular position of the wheel 14 of the sensor with respect to the stationary body 13 . Consequently, by measuring such angular position, it is possible to obtain, knowing the beforehand cited transmission ratio, the angular position of column 2 with respect to the pedestal 3 .
  • the sensing means of sensor 10 comprise a magnet associated to the wheel 14 and a sensing probe associated to the stationary body 13 , configured to sense the magnet angular position, and consequently the position of the wheel 14 of sensor 10 , with respect to the stationary body 13 based on the magnetic field variations generated by the rotations themselves.
  • the sensor 10 comprises an output 32 for transmitting a signal representative of the performed angular measurement.
  • the stationary body 13 of the sensor is connected to the pedestal 3 so that it can perform oscillations, between two end positions, with respect to it, about an oscillation axis, preferably offset from the wheel 14 rotation axis with respect to the stationary body 13 .
  • elastic means adapted to bias the stationary body 13 towards a position, between said oscillation end positions, are provided, so that the wheel 14 is biased against the tubular body 11 .
  • the pedestal 3 comprises a connecting plate 18 having a first hole 19 and a crescent-shaped slot 20 .
  • the stationary body 13 of sensor 10 is connected to the plate 18 by a first screw 21 crossing the first hole 19 of plate 18 and fixed in a first connecting seat 22 of the stationary body 13 , and by a second screw 23 crossing the crescent-shaped opening 19 of the plate 18 and fixed in a second connecting seat 24 of the stationary body 13 . Consequently, the stationary body 13 of sensor 10 can oscillate with respect to the plate 18 about the first screw 21 between two end positions set by the second screw 23 sliding between the opposite ends of the crescent-shaped opening 20 .
  • the first seat 22 and second seat 24 are disposed in opposite positions with respect to the wheel 14 rotation axis with respect to the stationary body 13 and such that the oscillation axis of stationary body 13 with respect to the plate 18 is parallel to the wheel 14 rotation axis with respect to the stationary body 13 .
  • the beforehand cited elastic means comprise a coil spring 25 fixed at a first end thereof by a third screw 26 in a third seat 27 of the stationary body 13 and fixed at a second end thereof by a fourth screw 28 in a fourth seat 29 of the connecting plate 18 .
  • the third 27 and fourth connecting seats 29 are disposed on a side opposite with respect to the side where the wheel 14 meshes the tubular body 11 .
  • the coil spring 25 is tensilely preloaded.
  • the preloaded coil spring 25 has a tendency, by tensilely acting, to bias the stationary body 13 , and consequently the wheel 14 , towards the left in FIG. 4 , where the connection of this latter to the tubular body 11 is provided. Therefore, in case of oscillations/deformations of the column 2 towards the left in FIG. 4 , the wheel 14 will have a tendency of following these oscillations/deformations while, in case of oscillations/deformations of the column 2 towards the right in FIG. 4 , the wheel 14 will be pressed against the tubular body 11 by a greater force due to the deformation of the coil spring 25 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Jib Cranes (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
US16/985,300 2019-09-02 2020-08-05 Limited rotation slewing ring crane Active 2040-08-08 US11208304B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000015388A IT201900015388A1 (it) 2019-09-02 2019-09-02 Gru a ralla con rotazione limitata
IT102019000015388 2019-09-02

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US20210061625A1 US20210061625A1 (en) 2021-03-04
US11208304B2 true US11208304B2 (en) 2021-12-28

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EP (1) EP3786100B1 (fr)
IT (1) IT201900015388A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115557408B (zh) * 2022-08-25 2024-04-02 杭州大杰智能传动科技有限公司 一种塔机回转传动及控制系统
CN117923348B (zh) * 2024-03-25 2024-05-17 云南银塔电力建设有限公司 一种用于设备维修的起重平台

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0542295U (ja) * 1991-03-27 1993-06-08 極東開発工業株式会社 ブーム装置の旋回規制装置
JPH0920500A (ja) * 1995-07-05 1997-01-21 Furukawa Electric Co Ltd:The ブーム搭載車、ブームの制御方法及び制御装置
US20120117810A1 (en) * 2010-08-24 2012-05-17 Schroeder Dierk Rotary position transducer assembly which compensates for radial play
JP6180962B2 (ja) * 2014-02-26 2017-08-16 日立住友重機械建機クレーン株式会社 旋回式作業機械の旋回角度検出装置
US20180118525A1 (en) * 2016-10-27 2018-05-03 O.ME.FA S.p.A. Officina Meccanica Fassi Device for supporting a cable of a capstan of a crane

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0542295U (ja) * 1991-03-27 1993-06-08 極東開発工業株式会社 ブーム装置の旋回規制装置
JPH0920500A (ja) * 1995-07-05 1997-01-21 Furukawa Electric Co Ltd:The ブーム搭載車、ブームの制御方法及び制御装置
US20120117810A1 (en) * 2010-08-24 2012-05-17 Schroeder Dierk Rotary position transducer assembly which compensates for radial play
JP6180962B2 (ja) * 2014-02-26 2017-08-16 日立住友重機械建機クレーン株式会社 旋回式作業機械の旋回角度検出装置
US20180118525A1 (en) * 2016-10-27 2018-05-03 O.ME.FA S.p.A. Officina Meccanica Fassi Device for supporting a cable of a capstan of a crane

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
JP 6180962B2 Machine translation (Year: 2017). *
JPH 0542295U Machine Translation (Year: 1993). *
JPH 0920500A Machine Translation (Year: 1997). *

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EP3786100B1 (fr) 2024-01-24
EP3786100A1 (fr) 2021-03-03
EP3786100C0 (fr) 2024-01-24
IT201900015388A1 (it) 2021-03-02
US20210061625A1 (en) 2021-03-04

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